QUALIFICATION OF POST INSTALLED REBAR SYSTEM Ir Ng Beng Hooi 24 th - PDF document

18.09.2019 QUALIFICATION OF POST INSTALLED REBAR SYSTEM Ir Ng Beng Hooi 24 th September 2018 1 CONTENTS • 1.0 The New ETA and Consideration behind EAD • 2.0 Design life for Post Installed Rebar and Anchor • 3.0 Fire Design for Post Installed Rebar • 4.0 Seismic for Post Installed Rebar 1

18.09.2019 EAD 330087 INCLUDES THE KEY APPLICATIONS WHICH CAN BE DESIGNED WITH POST-INSTALLED REBAR V M N Overlap joint for rebar connections Overlap joint at a foundation of a of slabs and beams column or wall N End anchoring of slabs or beams Components stressed primarily in (simply supported) compression SUMMARY OF QUALIFICATION AND DESIGN AS PER EAD 330087 FOR EACH APPLICATION Design Application Qualification Splices EAD Eurocode 2 Compres. N EAD Eurocode 2 Simply supp. EAD Eurocode 2 M connect. Rigid 2

18.09.2019 CURRENT APPLICATION OF HILTI METHOD: SIMPLY SUPPORTED AND RIGID CONNECTIONS Qualification Design Hilti design Application Splices EAD Eurocode 2 Compres. N EAD Eurocode 2 Simply supp. HIT Rebar Method first version for Eurocode 2 EAD HY200 and RE500V3 M connect. Rigid Hilti frame node model based on EC2 + HIT Rebar Method first version for HY200 and RE500V3 CURRENT APPLICATION OF HILTI METHOD: SIMPLY SUPPORTED AND RIGID CONNECTIONS Design Hilti design Application Qualification Splices EAD Eurocode 2 Compres. N EAD Eurocode 2 Simply HIT Rebar Method first version for supp. Eurocode 2 HY200 and HIT Rebar Method EAD second version for RE500V3 M Hilti frame node model based on connect. Rigid EC2 + HIT Rebar Method first version for HY200 and HIT Rebar Method second version for RE500V3 3

18.09.2019 LIST OF RELEVANT EOTA DOCUMENTS FOR QUALIFICATION OF POST-INSTALLED REBAR Organisation Document Roles and functions Remarks Qualification of post-installed Replacing EOTA TR 023 (2006). EAD 330087 (2018) EOTA reinforcement in Europe under static Design as per MS EN 1992-1-1 loading and fire exposure. (2010) and EN 1992-1-2 (2004). EAD 331522 Publication expected 2019. Post-installed rebar with mortar under (endorsed draft EOTA Design as per MS EN 1992-1 seismic action 2018) (2010). Replacing ETAG 001, Part 5 (2006). Qualification of post-installed anchors EAD 330499 (2017) EOTA Design according to EN 1992-4 in Europe under static loading. (2018). Qualification of post-installed anchors Design according to EN 1992-4 EOTA TR 049 (2016) EOTA in Europe under seismic loading. (2018) or EOTA TR 045 (2013). 8 CONTENTS • 1.0 The New ETA and Consideration behind EAD • 2.0 Design life for Post Installed Rebar and Anchor • 3.0 Fire Design for Post Installed Rebar • 4.0 Seismic for Post Installed Rebar 4

18.09.2019 BACKGROUND Where do service life requirements come from? 1. Eurocode 1990 “working life category 5” - infrastructure Adapted from EN 1990 Table 2.1 —“Indicative design working life” Design working Indicative design Examples life category working life (years) 1 10 Temporary structures 2 10-25 Replaceable structural parts 3 15-30 Agricultural and similar structures 4 50 Buildings and other common structures 5 100 Monumental buildings, bridges, and other civil structures Image source: Hilti image bank 3. Owners 2. National standards Example: Burj Khalifa Examples: UK, Italy, Cyprus Hyperlinks to documents embedded in image Image source: CNN 10 BACKGROUND 100 years is gaining worldwide attention – and confusion Article summary • Click screenshot for link to article 100 years is a hot topic right now, but there is no guidance for how to address it • Owners must be more clear about their expectations up-front in order to meet them • “Durability” is a vague word that nobody has seriously considered for service life Service life for anchors/PIR • Assessment of anchors and rebar has always implied a 50-year service life • Where 100 years is needed, it has been handled on a case-by-case basis • No harmonized standards have accounted for service life, leaving confusion about how to extend it With the first ETA for 100-year assessment of anchors, Hilti is taking the first step to clearing up the confusion in our industry and taking a role in the bigger conversation about service life. 11 5

18.09.2019 NEW ETA ADDRESSING THE 100YR SERVICE LIFE TOPIC WHICH FOLLOW A NEW EAD ETA-16/0143 ETA-16/0142 Dated 14/05/2019 Dated 27/05/2019 RE500V3 – Anchoring for RE500V3 – Rebar connection for static/quasi static, seismic static/quasi static, fire & seismic in 50 & 100 years service life in 50 years service life 12 TESTING FOR 50 YEARS Sc Scope, EAD EAD 330499 (bonded fasteners) : The performance characteristics are consistent with the design provisions of EN 1992-4 and are based on a design working life of 50 years . So, which tests actually connect to 50 years? time/cycle-independent tests time/cycle-dependent tests reference tests freeze/thaw testing/assessment not “robustness” (dry, wet, flooded, poorly mixed) durability (alkalinity/sulfur) tied to 50 years max long/short-term temp. seismic tests not relevant for service life maximum torque moment installation direction sustained load testing/assessment are tied service condition tests to 50 years crack movement Must be considered in a 100-year EAD 13 6

18.09.2019 IS DIFFERENCE PULL OUT TEST AT SITE AND SUSTAINED LOAD TEST IN LABORATORY 17 CONTENTS • 1.0 The New ETA and Consideration behind EAD • 2.0 Design life for Post Installed Rebar and Anchor • 3.0 Fire Design for Post Installed Rebar • 4.0 Seismic for Post Installed Rebar 7

18.09.2019 WHY IS FIRE DESIGN IMPORTANT? FUNDAMENTAL REQUIREMENTS ACCORDING TO EC2 When subjected to fire exposure construction elements performances are reduced causing fall of structures → Fire causes significant costs losses and deads In the event of fire have adequate resistance for the required period of time exposure: concrete structure shall be designed and constructed in a way that they maintain their load bearing function during the relevant fire exposure. (Eurocode 2 provisions) Post-installed rebar design in fire 19 EUROPEAN REGULATORY FRAMEWORK FOR POST- INSTALLED REBAR “Rebar theory” “ Design of rebar as a rebar ” Seismic Fire Static Product EAD x Qualification CSTB regional Technical data ETA approval Design method EC2 EC2 based Post-installed rebar design in fire 20 8

18.09.2019 WHICH ARE THE PARAMETERS TO BE DEFINED FOR A FIRE DESIGN BASED ON EC2? Fire resistance criteria 1 2 Time exposure Design approach 3 4 External fire action 5 Fire structural resistance Post-installed rebar design in fire 21 WHEN SUBJECTED TO FIRE EXPOSURE CONSTRUCTION ELEMENTS RESISTANCE IS REDUCED Steel Concrete Mortars EC2 Concrete strength [N/mm 2 ] Steel strength [N/mm 2 ] 0 500 1000 1500 0 500 1000 1500 Temperature ( θ ) [°C] • • Mortars have high sensitivity to Efficiently behaviour in fire • Reduction of strength when conditions temperatures, it should be part subjected to high temperatures • Non-combustible of the consideration in our PIR • No emissions of smoke design • Good thermal insulation Post-installed rebar design in fire 22 9

18.09.2019 IN THE REGULATORY FRAMEWORK OF REBAR THEORY A NEW EAD FOR FIRE IS AVAILABLE Old! New! CSTB, DIBt, Efectis, CTICM have EAD Qualification internal qualification criteria* «Rebar Fire» (“testing”) (National level) (European level) Tech. Data DIBt / Efectis / CTICM / CSTB ETA (for post-installed rebar) (“approval”) reports e.g. ETA 15/0297 Design Local design recommendations EN 1992-1 (Eurocode 2 - Part 1.2) *No more national approvals will be issued. Some approvals of competitors are valid until 2020. Post-installed rebar design in fire 23 THE NEW EAD INCLUDES METHODS AND CRITERIA FOR ASSESSING THE FIRE PRODUCT PERFORMANCE Products are tested according to a specific established procedure. Post-installed rebar design in fire 24 10

18.09.2019 IN THE REGULATORY FRAMEWORK OF REBAR THEORY FIRE PERFORMANCE IS INCLUDED IN THE ETA Old! New! CSTB, DIBt, Efectis, CTICM have EAD Qualification internal qualification criteria* «Rebar Fire» (“testing”) (National level) (European level) Tech. Data DIBt / Efectis / CTICM / CSTB ETA (for post-installed rebar) (“approval”) reports e.g. ETA 15/0297 Design Local design recommendations EN 1992-1 (Eurocode 2 - Part 1.2) *No more national approvals will be issued. Some approvals of competitors are valid until 2020. Post-installed rebar design in fire 25 DIBT AND CSTB REPORTS INCLUDE TABULATED VALUES OF BOND STRENGTH OR LOAD FOR FEW APPLICATIONS • • Wall to wall connections Slab to wall connections • • Only member analysis possible Only member analysis possible • • R criteria R criteria Post-installed rebar design in fire 26 11

18.09.2019 THE NEW ETA PROVIDES A BOND STRENGTH AS FUNCTION OF TEMPERATURE THE FIRE CURVE IS NOW EXTENDED TO 305°C . • The fire curve shows the mortar behavior in fire New Extension • The reduction factor - Up to 305°C!! calculated based on - Much more resistance!! temperature is applied to the characteristic bond strength in order to calculate the fire bond strength IN THE PAST, THE BEHAVIOR OF THE MORTAR WAS FUNCTION OF APPLICATIONS Old! New! Bond strength [N/mm 2 ] Slab to slab Slab to wall Application Bond strength as function of temperature: Bond strength as function of application every application is covered! Post-installed rebar design in fire 28 12